大气多次散射效应对星载激光测高仪测距偏差值的影响  

Influence of atmospheric multiple scattering effects on the range bias for satellite laser altimeter

作　　者：陈舒杭[1] 李子乐[1] 陈梦竹[1] 胡磊[1] 周辉[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《红外与激光工程》2012年第9期2522-2526,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(40901165);民用航天"十二五"预先研究项目(固体地表要素获取遥感载荷数据处理关键技术研究);中央高校基本科研业务费专项资金(274805)

摘　　要：大气多次散射效应会使得星载激光测高仪脉冲回波信号发生拖尾现象,导致激光测高仪的测距值出现偏差。根据激光测高仪的工作原理并利用半解析型蒙特卡罗方法,建立了大气多次散射效应条件下的脉冲回波信号及距离偏差的数学模型,并基于GLAS系统参数,仿真分析了云和雾的多次散射效应对距离偏差值的影响规律。结果表明,随着大气参数的变化,距离偏差会呈现不规则的起伏变化。当云层粒子尺度大于150μm或雾的消光系数小于1.68 km-1时,大气多次散射效应对测距偏差值的影响小于1 cm。所得的结论为星载激光测高仪测量天气的选取以及系统参数的优化提供了理论依据。The atmospheric multiple scattering can produce a lag in the received pulse signal of satellite laser altimeter（SLA）,which may introduce range bias for SLA.According to the operational principle of SLA and the semi-analytic Monte Carlo method,the mathematical models of the received pulse signal and range bias were built up in the condition of atmospheric multiple scattering.Based on the parameters of geoscience laser altimeter system（GLAS）,the impacts of cloud and fog onto the range bias were simulated and analyzed.The results show that irregular fluctuation change appears in the range bias with varying atmospheric parameters.The range bias is less than 1 cm only if the effective radius of cloud particle size distribution is greater than 150 m or the extinction coefficient of fog is less than 1.68 km-1.The conclusions provide theoretical foundation for the choice of weather condition with measurements and parameters optimization for SLA.

关 键 词：星载激光测高仪 半解析型蒙特卡罗 大气多次散射 距离偏差 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] TN249[自动化与计算机技术—控制科学与工程]